1. Evolvulus alsinoides (Linnaeus) Linnaeus, Sp. Pl., ed. 2. 392. 1762.
土丁桂 tu ding gui
Herbs perennial. Stems several to numerous, prostrate or ascending, slender, with appressed and spreading hairs. Leaves petiolate or subsessile, 0.7-2.5 cm X 5-10 mm. Cymes 1- to few flowered; peduncles filiform, 2.5-3.5 cm; bracts linear-subulate to linear-lanceolate, 1.5-4 mm. Sepals lanceolate, 3-4 mm, villous. Corolla rotate, 7-10 mm in diam. Stamens included; filaments filiform, adnate to base of corolla tube. Ovary glabrous. Styles 2, free. Capsule globose, 4-valved. Seeds 4 or fewer, black, smooth. Fl. and fr. year round. 2n = 26.
Sandy soil, dry slopes, cultivated areas, maritime areas, grasslands, thickets, roadsides; 0-1800 m. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hubei, Hunan, Jiangsu, Jiangxi, Qinghai, Sichuan, Taiwan, Xizang, Yunnan, Zhejiang [Bangladesh, Cambodia, India, Indonesia, Japan (Ryukyu Islands), Laos, Malaysia, Myanmar, Nepal, Pakistan, Philippines, Thailand, Vietnam; Africa, Australia, North America, Pacific Islands, South America]